结肠癌在欧美国家是威胁人类健康的第2大恶性肿瘤,每年大约56000人死于本病[1]。结肠癌的发生是遗传、饮食、环境等多种因素相互作用的结果。近年随着人们生活水平的提高和饮食结构的改变,结肠癌的发病率由原来的第6位上升到第4位[2]。传统的结肠癌的筛查方法是粪便潜血试验,钡 Colon cancer in Europe and the United States is the second most common malignant tumor that threatens human health. About 56,000 people die of this disease each year. The occurrence of colon cancer is the result of the interaction of many factors such as genetics, diet and environment. In recent years, with the improvement of people’s living standards and changes in diet, the incidence of colon cancer increased from 6 to 4 [2]. Traditional colon cancer screening method is fecal occult blood test, barium